It’s winter here now. It’s not true that a ‘true fever’ will keep temperature high. On night shifts when I am called to patients that are febrile (using more sensitive tympanic or sublingual thermometers) I often ask them to check again in half an hour to kick it down the road (at which time they are generally non-febrile) provided they have a known cause and are on adequate treatment. Although the Pathogenesis of hyperthermia in this instance is usually from a slightly different cause (ie bacterial rather than viral)